diff --git a/app/chain/download.py b/app/chain/download.py
index a49d36dc..7a192908 100644
--- a/app/chain/download.py
+++ b/app/chain/download.py
@@ -374,7 +374,7 @@ class DownloadChain(ChainBase):
                     exist_seasons = exists_tvs.get("seasons")
                     if exist_seasons.get(season):
                         # 取差集
-                        episodes = set(episodes).difference(set(exist_seasons[season]))
+                        episodes = list(set(episodes).difference(set(exist_seasons[season])))
                     # 添加不存在的季集信息
                     __append_no_exists(season, episodes)
             # 存在不完整的剧集